C is for chair.

In an otherwise meticulously scripted Republican National Convention, actor Clint Eastwood, with no vetting from the Romney campaign, engaged in a rambling debate with an imaginary President Obama, represented by an empty chair, on stage in Tampa.

In an otherwise meticulously scripted Republican National Convention, actor Clint Eastwood, with no vetting from the Romney campaign, engaged in a rambling debate with an imaginary President Obama, represented by an empty chair, on stage in Tampa. (Mark Boster, Los Angeles Times)

In an otherwise meticulously scripted Republican National Convention, actor Clint Eastwood, with no vetting from the Romney campaign, engaged in a rambling debate with an imaginary President Obama, represented by an empty chair, on stage in Tampa.Mark Boster, Los Angeles Times